<?php
require_once "Computer.php";
class Dell implements Computer {
    private static $color;
    private static $system;
    public function color($color)
    {
        self::$color = $color;
    }
    public function system($system)
    {
        self::$system = $system;
    }
    public function getName()
    {
        return self::$color ."--". self::$system. "戴尔";
    }
}
